From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E564686334 for ; Fri, 25 Apr 2025 04:54:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745556866; cv=none; b=ofEmZ7u12kTqACGlb2Z9AD32ddvr4CJX4Y9Z2c3zfUBAroryM6WjPM3DHVm7ynCnDRXGqLyAkGgjHbvbHpL8MndrO9f3oBpJRtgkZeLyr1T+oXjde9SGC4app1tJFWS9/QALhUQvaP9DDkkv6e+gkRouYMdWdDOExbD/jQnDPQ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745556866; c=relaxed/simple; bh=FXOXzT4qZhFzYZwTqlusME8d6s2prRPkxrCbQKlt1qQ=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=iKKZA6BuoqQw4BCQyfnJKkK/ioYZpxljyUtr//9IqMyfVsg9xQM4BS0pspkBiKbIhSjKeDpUoFCLwOTCL7KYgb5ucsIwh0ZeB4dBa0FlLdyAOtItBO1vMMsycKuEGmpPpSbVr63eOdu+nawYgXZg59WJlpku6VqyYCDw9jDx85Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f199.google.com with SMTP id e9e14a558f8ab-3ce8dadfb67so20322065ab.1 for ; Thu, 24 Apr 2025 21:54:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1745556864; x=1746161664; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=DS3nbEou4P2iGpRExoVX6nUcTVBdkwNtenUz4/IXWQU=; b=Ui+UowUcX28lYA78yHx0br79olxxIJUaIwECt3cFD/9wP1tRhS4671Sx5Bhc5Scq9v KgiCMUtix3rtpFnkgXUjSSIQNbtFbrhN0L/qp4UFLnwZ3TEgjbKbKcbPx+grnOOXzcFg /T497GjjAyI6ffTXJ/E17dZWEcVH+gwomaNMVuZHvpGFXyNkhGB7L1zFdT9nAqFqcOhQ yEar8u7tWMSIxmei/UH9nx7vBXKaHwvmodALAWMzbU7sBrfphtUqyq/mC9SimIlbF0p4 wBbkz0zOiBHaLg9BzZnMxQJEizrEgZG8Mw11s9y+D5EQ4xkIpMXuu0KuG2/2CbBZZGME gKuA== X-Gm-Message-State: AOJu0YyIqH+r22fRmfx/62ZTmVtt3qN/WhastGFaqxnmJ99qTdRD03Pi fDuSdMm/LcciII+DkiSMeRD5hoYROQfoD7h+ftCbtdp22QLPzLoeWG4656CrkDTnYGNGPSZFQvw 2nTQxAr8K8use0XN6Tw6Eh2p572yfvYe31ukNGfhV48yypHfq43bbbWQ= X-Google-Smtp-Source: AGHT+IGN6CJZXhbEB9UpDoq+URaZ5XPGtJ364x3Y+Ubyh0XN8Fwr0eRMrDJAZzKNULNFMKA8r0txcQKHqNO+R8UuZx/JNcinXQzQ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3e8e:b0:3d6:d162:be02 with SMTP id e9e14a558f8ab-3d93b5eee0fmr9204115ab.21.1745556864024; Thu, 24 Apr 2025 21:54:24 -0700 (PDT) Date: Thu, 24 Apr 2025 21:54:24 -0700 In-Reply-To: <680a45db.050a0220.10d98e.000a.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <680b1580.050a0220.2c0118.0c73.GAE@google.com> Subject: Re: [syzbot] Re: [syzbot] [block?] BUG: unable to handle kernel NULL pointer dereference in lo_rw_aio From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: Re: [syzbot] [block?] BUG: unable to handle kernel NULL pointer dereference in lo_rw_aio Author: lizhi.xu@windriver.com selinux policy not support read_iter #syz test diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 4f968e3071ed..3572b50dbf0a 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1044,6 +1044,10 @@ static int loop_configure(struct loop_device *lo, blk_mode_t mode, if (!file) return -EBADF; + + if (unlikely(!file->f_op->read_iter)) + return -EINVAL; + is_loop = is_loop_device(file); /* This is safe, since we have a reference from open(). */